I have a personal theory that genetics and survival just need to be good enough. They may find other local maxima and improve things. But they don't need to be

I have a personal theory that genetics and survival just need to be good enough. They may find other local maxima and improve things. But they don't need to be perfect in every dimension. There is room for stuff that doesn't make sense to human logic. In addition because species don't generally breed with other species you need to find those optimisations through chance within a species. And genes are not a feature list. Turn one gene on and something else may turn off. There are trade off too.